原始的整合方式
1.添加依赖
<!--mybatis起步依赖--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <!--mysql驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> <!--阿里巴巴连接池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency>
2.在spring boot 配置文件配置连接池参数和mybatis参数
# 解决程序乱码
spring:
http:
encoding:
charset: utf-8
enabled: true
force: true
messages:
encoding: UTF-8
thymeleaf:
cache: false #是否开启模版缓存
check-template: true
check-template-location: true
enabled: true
encoding: UTF-8
mode: HTML5
prefix: classpath:/templates/
suffix: .html
datasource:
name: test
url: jdbc:mysql://127.0.0.1:3306/haoyangback?characterEncoding=UTF-8
username: root
password: root
# 使用druid数据源
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 1
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxOpenPreparedStatements: 20
mybatis:
mapper-locations: classpath:mapping/*.xml #扫描mapping
type-aliases-package: com.liqiang.entity #别名前缀 配置类名就不用写全称了
4.添加逆向工程插件依赖
<build> <plugins> <!--mybatis逆向工程插件--> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <configuration> <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile> <overwrite>true</overwrite> <verbose>true</verbose> </configuration> </plugin> </plugins> </build>
5.添加逆向工程xml路径 为上面插件配置路径下
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包--> <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包--> <classPathEntry location="D:\MavenRepository\mysql\mysql-connector-java\5.1.35\mysql-connector-java-5.1.35.jar"/> <context id="DB2Tables" targetRuntime="MyBatis3"> <commentGenerator> <property name="suppressDate" value="true"/> <!-- 是否去除自动生成的注释 true:是 : false:否 --> <property name="suppressAllComments" value="true"/> </commentGenerator> <!--数据库链接URL,用户名、密码 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/haoyangback?characterEncoding=UTF-8" userId="root" password="root"> </jdbcConnection> <javaTypeResolver> <property name="forceBigDecimals" value="false"/> </javaTypeResolver> <!-- 生成模型的包名和位置--> <javaModelGenerator targetPackage="com.liqiang.entity" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> <property name="trimStrings" value="true"/> </javaModelGenerator> <!-- 生成映射文件的包名和位置--> <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources"> <property name="enableSubPackages" value="true"/> </sqlMapGenerator> <!-- 生成DAO的包名和位置--> <javaClientGenerator type="XMLMAPPER" targetPackage="com.liqiang.mapper" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> </javaClientGenerator> <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名--> <table tableName="address" domainObjectName="Address" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table> </context> </generatorConfiguration>
6.添加maven执行逆向工程插件的快捷命令
7.选中执行
则会在上面配置的下面生成实体 还有Mapper和mapper.xml
public interface AddressMapper { int deleteByPrimaryKey(Integer id); int insert(Address record); int insertSelective(Address record); Address selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(Address record); int updateByPrimaryKey(Address record); }
8.在splring boot 入口类开启mapper包扫描
@SpringBootApplication @MapperScan("com.liqiang.mapper") public class SpringBootHellwordApplication { public static void main(String[] args) { SpringApplication.run(SpringBootHellwordApplication.class, args); } }
在Services注入Mapper则可以进行简单的增删改查
@Resource
AddressMapper addressMapper;
使用PageHelper
mybatis本身支持分页 但是不是物理分页。mybatis的分页是 查询sql服务端查询所有满足条件的数据 然后通过ResultSet 跳过多少行取多少行(性能没有物理分页好)
使用PageHelper插件 则是在我们原有的sql上 拼接 select * from (sql) limit 1,4 分页语法
1.添加分页插件起步依赖
<!-- 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.1.2</version> </dependency>
2.在spring boot 配置文件配置分页插件参数
#pagehelper
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
returnPageInfo: check
3.mapper新增一个父id找到子节点id的方法
public interface AddressMapper { int deleteByPrimaryKey(Integer id); int insert(Address record); int insertSelective(Address record); Address selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(Address record); int updateByPrimaryKey(Address record); List<Address> selectByParentId(Integer id); }
4.对应的mapper.xml修改
<sql id="Base_Column_List" > id, parentId, areaCode, areaName, areaType, geo, path, haveSub </sql> <select id="selectByParentId" resultMap="BaseResultMap" parameterType="java.lang.Integer"> SELECT <include refid="Base_Column_List"/> from address where parentid= #{id,jdbcType=INTEGER} </select>
5.使用
PageHelper.startPage(pageNum, pageSize);//分页
List<Address> address=addressMapper.selectByParentId(3619);
实现原理是 pageHelper利用mybatis提供的插件开发接口进行了扩展 ,可以理解成 pageHelper.startPage会将参数存入线程缓存。然后pageHelper在mybatis的执行sql那一步进行拦截判断取出线程缓存如果有分页 则将sql改变成分页的形式